Oil burner



Oct. 29, 1935. R KELLY ET AL 2,019,012

OILBURNER I Filed May 31, 1933 2 Sheets-Sheet 1 IIIHHHHHHHHHHI mm Inve 27/350 Yns James 1? Kelly, c/ZZdenBz'Fce, 59 M 5% @r/W,

Oct. 29, 1935.

J. P. KELLY ET A1.

OIL BURNER Filed May 31, 1933 2. Sheets-Sheet 2 Inveni'ozus James PKeZZg, cHZden 1 1/726, ii-wigs vertically by threaded legs 25 and nuts 21.

Patented Oct. 29, 1935 UNITED STATES PATENT OFFICE OIL BURNER Application May 31, 1933, Serial No. 673,706 3 Claims. (Cl. 158-76) This invention relates to improvements in oil burners of the so-called gun typef, in which an oil conduit having an outlet orifice, or nozzle, is disposed longitudinally within an air conduit or draft tube, having an outlet orifice adjacent and outwardly beyond the nozzle, the mixture of atomized oil and air being initially ignited by a spark across a gap between two electrodes Within the draft tube.

The invention will be understood by reference to the following description, when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be pointed out more particularly in the appended claims.

In the drawings:

Figs. 1 and 2 are, respectively, side and front elevations of an oil burner embodying the invention;

Fig. 3 is a longitudinal, sectional view, on an enlarged scale, of the draft tube with the parts therein shown in elevation;

Fig. 4 is a cross-sectional View, on an enlarged scale, of the draft tube with the parts therein shown in elevation; and

Fig. 5 is a sectional View, on an enlarged scale, on line 5-5 of Fig. 2.

Referring to the drawings, and to the embodiment of the invention illustrated therein, there is shown an oil burner comprising an air conduit or draft tube (see Fig. 1), to which air is supplied by an impeller such as a fan 9, mounted within a fan housing II, and driven by an electric motor l3. The air supply is drawn through an air shutter l5, provided with a safety screen I1, and is delivered to the fan, whence it passes through the draft tube, which has an outlet orifice l9 (see Fig. 3), intended to be placed within a combustion chamber. The fan housing is adjustably supported by a threaded leg 2| (see Fig. 1) on a base 23, whose forward end is adjustable Each of these legs has a floor plate 29.

An oil conduit 3| (see Fig. 3) extending lengthwise within and concentrically disposed with relation to the draft tube, is provided with a nozzle 33, having an outlet orifice 35 rearwardly of the air outlet orifice I9 of the draft tube. The oil issuing from the nozzle in the form of a spray is mingled with the air issuing from the draft-tube, and the resulting mixture is initially ignited by a high tension spark across a gap between two electrodes 31, which are mounted in insulators 39, to which electrodes high tension current is supplied through insulated wires 4| by a transformer 43. The insulators are mounted as by a clamp 45 on the oil conduit 3|. About the oil conduit 3| is an air deflector 41, having fan-like blades 49, which impart a rotary movement to the air passing through the draft tube. An oil 5 pump 5|, driven by the motor, draws oil from the source of supply, and pumps it through a regulating valve 53, and a pipe 55, to the oil conduit 3| within the draft tube The oil burner, as thus far described, is of 10 known construction. The novel features will now be described, reference being had at first to Fig. 3. Heretofore, it has been customary to provide the draft tube with an inspection port or opening in its upper side, with a removable cover by means of which access may be had to the interior of the draft tube, to inspect the parts therein, and to make necessary adjustments and repairs. It has also been customary to provide just below this port a union coupling at about the central portion of the oil conduit, so that the forward portion of the latter can be detached from the rearward portion, and taken out upwardly through the port for inspection of the electrodes and the nozzle. However, in practice, it is found diflicult to maintain a tight joint between the ground surfaces of the union coupling, particularly as these surfaces are apt to become scored. If an oil leak develops in the coupling, or if the oil regulating valve becomes clogged and. does not seat properly, and oil drips from the nozzle into the draft tube, it is practically impossible to determine, after the parts have been assembled and the burner is in operation, whether the leak is in the union coupling or from the nozzle. There is no way of inspecting the coupling when the latter is under pressure, because it is necessary for the cover of the port to be in place when. the burner is in operation. If oil accumulates in the draft tube, and burns while the burner is shut off (no air then being supplied), the oil carbonizes, fouls the nozzle and electrode assembly, and in a short time renders the burner inoperative. Moreover, the combustion chamber and chimney become fouled with soot, and anunpleasant odor escapes into the building. To overcome these difficulties, instead of providing a port at the upper portion of the draft tube and a coupling in the oil conduit therebelow, we have provided a novel construction and arrangement, in which the inspection port is at the bottom of the draft tube, and the only coupling which it is necessary to take apart is outside the draft tube in a position where it may be observed for possible leakage when under pressure. This novel construction will now be described, reference still being had to Fig. 3.

In accordance with our invention, the draft tube is provided in its under side with an inspection port 51, which is normally closed by a semi-cylindrical spring cover 59, clasped about the draft tube, and which is of somewhat larger dimensions than the inspection port. Although this cover has a fairly snug fit on the draft tube, sufficient to prevent undue escape of air, there is nevertheless an opportunity for any oil leaking from the nozzle when the regulating valve is clogged to gravitate along the bottom of the draft tube to the inspection port, and past the marginal portion of the cover onto the floor, where it will be readily observable, and will serve as a warning that the regulating valve needs. attention. To encourage the flow of oil rearwardly through the inspection port, the draft tube is inclined rearwardly and downwardly somewhat. This 'isrendered conveniently possible by proper adjustment of the two threaded legs 25 (see Fig. 1).

The rear end of the oil conduit 3| is conven+ i'e'ntly supported at the rear of the inspection port, as by a collar 6| secured thereto by a sets'crew 63, and provided with a pair of legs 65 (see Fig. 4), which rest upon the inner surface of the draft tube, just at the rear of the inspection port 51. The rear end of the oil conduit 31 is connected by an elbow 51, and by a compression coupling 69, to the hereinbefore described pipe 55, which leads from the regulating valve 53. It 'is unnecessary, however, to disturb this coupling when it is once assembled, as the pipe 55 is connected to the regulating valve by a compression coupling H (see Fig. 5), which comprises a sleeve '53 internally threaded to receive a nipple 15 at the lower end of the regulating valve. The nipple is provided at its lower end with a conical seat 11, and the sleeve 13 is provided with a corresponding conical seat 79, and between these two seats, the upper end of the pipe 55, which is or soft copper, is belled outwardly as at 8 I, and clamped between the two seats. This joint, being outside the draft tube, can be observed when under pressure, and if any leakage should occur, correction can readily be made. Inasmuch as the tube is made of annealed copper, it is so soft that dirt lodging on the bell becomes embedded therein. In case the bell becomes worn, it can be cut off, and the tube re-belled.

It is important that the nozzle should be located accurately with reference to the outlet orifice of the draft tube, and this is conveniently accomplished in accordance with our invention by providing the pipe 55 with a vertical portion 83 (see Fig. 3), which is located at the rear end of a longitudinal slot 85 extending rearwardly from the rear end of the inspection port 51, and constituting in effect a part thereof, while the rear end of the cover 59 rests against this portion of the pipe, and thus accurately determines the front end of the slot 85, whereupon the assembly 7 can be withdrawn downwardly and rearwardly through theinspection port. The ease and convenience of this will readily be appreciated. It is possible in practice to remove the assembly in less than a minute.

Having thus described one embodiment of the invention, but without limiting ourselves thereto,

what we claim and desire to secure by Letters 5 Patent is:-

1. In an oil burner, the combination of a unitary oil tube, igniter, and supporting structure comprising a horizontally disposed oil tube having at its front end a nozzle provided with a hori- 10 zontally and forwardly directed outlet orifice, a pair of electrodes supported by said tube adjacent to said nozzle, and front and rear supports carried by and movable with the front and rear portions of said tube; a generally horizontal draft tube 15 about said unitary structure and having at its front end a. horizontally directed outlet orifice smaller than said front support and preventing forward withdrawal of said unitary structure, said draft tube being provided with a rearwardly 20 ports resting loosely upon the internal surface of said draft tube; a removable cover which normally covers said opening; an oil supply pipe having a portion disposed externally of said draft tube and a portion which extends laterally into said draft tube rearwardly of said cover; and a pipe coupling which couples said upwardly ex"- tending portion of said oil supply pipe to the rear end of said oil tube rearwardly of said rear support. 35

2. In an oil burner, the combination of au'nitary oil tube, igniter, and supporting structure comprising a horizontally disposed oil tube having at its front end a nozzle provided with a horizontally and forwardly "directed outlet orifice, a 40 pair of electrodes supported by said tube adjacent to said nozzle, and front and rear supports for the frontand rear portions of said tube; a generally horizontal draft tube about said unitary structure and having at its front end a horizontally directed outlet orifice, said draft tube being provided. with a rearwardly disposed air inlet orifice, and being provided between said supports with an opening of sufficient size to permit of the removal of said unitary structure '50 therethrough, said draft tube being provided with a slot extending rearwardly from said opening; a removable cover which normally covers said opening; an oil supply pipe having a portion disposed externally of said draft tube and a portion which '55 extends through said slot into said draft tube; and a pipe coupling which couples the last-mentioned portion 'of said oil supply pipe to said 011 tube.

3. In an oil burner, the combination of "a fiiif- U0 tary oil tube, igniter, and supporting 's'tructufe comprising a horizontally disposed oil tube having at its front end a nozzle provided with aiho'rizontally and forwardly directed outlet orifice, a pair of electrodes supported by saidtube adj'a- 68 7 cent to said nozzle, and front and rear supports carried by and movable with the frontand rear portions of said tube; a generally horizontal draft tube about said unitary structure and having at its front end a horizontally directed outlet ori- 79' fice smaller than said front support and preventing forward withdrawal of said unitary structure, 7 said draft tube being provided with a rearwardly disposed air inlet orifice, andubeing provided with .7.

an opening of sufflcient size to permit of the removal or said unitary structure including said supports therethrough; a removable cover which normally covers said opening; an oil supply pipe 5 having a portion disposed externally of said draft tube and a portion which extends into said draft tube; and a pipe coupling rearwardly of said rear support, which coupling couples the last-mentioned portion of said oil supply pipe to said oil tube.

JAMES P. KELLY. ALDEN PIKE. 

